WO1998055303A1 - Signal processing method - Google Patents
Signal processing method Download PDFInfo
- Publication number
- WO1998055303A1 WO1998055303A1 PCT/DE1998/001442 DE9801442W WO9855303A1 WO 1998055303 A1 WO1998055303 A1 WO 1998055303A1 DE 9801442 W DE9801442 W DE 9801442W WO 9855303 A1 WO9855303 A1 WO 9855303A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- engraving
- light
- depth
- setting value
- new
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/045—Mechanical engraving heads
Definitions
- the invention relates to the field of electronic reproduction technology and relates to a method for signal processing in an electronic engraving machine for engraving printing forms, in particular printing cylinders, for gravure printing.
- an engraving element with an engraving stylus as a cutting tool moves in the axial direction along a rotating printing cylinder.
- the engraving stylus which is controlled by an engraving control signal, cuts a sequence of depressions, called cups, arranged in a gravure printing screen into the outer surface of the printing cylinder.
- the engraving control signal is formed in a signal processing stage by superimposing an engraving signal representing the tonal values between "light” (white) and "depth” (black) with a periodic raster signal (vibration). While the raster signal causes the engraving stylus to vibrate to generate the raster, the engraving signal controls the geometrical parameters of the engraved cells such as the longitudinal diagonal, transverse diagonal and cutting depth in accordance with the tonal values to be reproduced.
- a calibration of the gray signal values for "light” and “depth” takes place, the overlay of the corrected engraving signal with the raster signal for generating the engraving control signal and the amplification of the engraving control signal.
- the engraving signal value for "light” changes at the same time. This results in an incorrect transverse diagonal of the engraved cells for "light”, and the operator must disadvantageously correct the engraving signal value for "light” so that the transverse diagonal or the engraved tone value remains constant when the engraving signal value changes for "depth”. It is therefore an object of the present invention to improve a method for signal processing in an electronic engraving machine for engraving printing forms, in particular printing cylinders, for gravure printing in such a way that the engraving signal value for "light” is automatically kept constant when the engraving signal value for " Depth "changes.
- 1 is a basic block diagram of an engraving machine for engraving printing forms with a signal processing stage
- Fig. 2 shows an embodiment for a signal processing stage
- Fig. 3 is a graphical representation to explain the method.
- a pressure cylinder (1) is rotatably driven by a rotary drive (2).
- An engraving member (4) mounted on an engraving carriage (3) with an engraving stylus as a cutting tool moves in the axial direction along the rotating printing cylinder (1) with the aid of a spindle (6) driven by a feed drive (5).
- the engraving stylus of the engraving member (4) which is controlled by an analogue engraving control signal (G) on a line (7), cuts a series of engraving lines in a gravure pattern into the outer surface of the rotating printing cylinder (1) while the engraving member (4) is axially aligned moved along the pressure cylinder (1).
- the engraving element (4) is designed, for example, as an engraving element with an electromagnetic drive for the engraving stylus. While a periodic raster signal causes the engraving stylus to vibrate to generate the gravure screen, engraving data (GD) determine the depth of penetration of the engraving stylus into the outer surface of the printing cylinder (1) in accordance with the tonal values to be engraved between "light" and "depth".
- the engraving data (GD) are made available in an engraving data computer (8) for engraving line for engraving line, whereby each engraving cell is assigned an engraving date of at least one byte, which contains the tone value to be engraved, among other things, as engraving information.
- Control data (SD) for controlling the signal processing are also provided in the engraving data computer (8).
- Engraving data (GD) and control data (SD) are forwarded via a data bus (9) to a signal processing stage (10), in which the engraving control signal (G) for the engraving member (4) is generated.
- a pulse generator (11) is mechanically coupled to the printing cylinder (1).
- the pulse generator (11) generates a synchronization clock sequence (T SYN ), which is sent via a line (12) to the engraving data computer (8) and to the signal processing stage (10).
- Fig. 2 shows an embodiment for the signal processing stage (10).
- the engraving data (GD) and the control data (SD) are transmitted to a signal processor (13) via the data bus (9).
- the input engraving data (GD) are stored in the signal processor (13) with the aid of stored setting values (EP L ) for "light” and of setting values (EP T ) for "depth” by calibration in this way in output engraving data (GD ') implemented that the actually engraved actual tonal values "light” and “depth” correspond to the predetermined target tonal values "light” and “depth”.
- a processor is used as the signal processor (13) which enables fast floating point operations, preferably a digital signal processor (DSP).
- DSP digital signal processor
- the TMS 320C31 digital signal processor from Texas Instruments can be used as the signal processor (13), for example.
- the setting values (EP L ) for "light” and the setting values (EP T ) for "depth” can be modified in a preferred manner by transmission coefficients (k x ).
- the input engraving data (GD), the transmission coefficients (k x ) and / or the calculation and linking algorithms for the input engraving data (GD) can be changed by the control data (SD).
- GD ' (GD x k.,) X (EP L xk 2 ) + EP ⁇ xk 3
- GD ' L (GD L xk 1 ) x (EP L xk 2 ) + EP T xk 3 (gain correction)
- the raster signal-determining vibration data (VD) determining the raster signal are added in an adder (14) according to the following equation:
- GSD (GD xk 1 ) x (EP L xk 2 ) + EP ⁇ xk 3 + VD
- the engraving control data (GSD) are converted into the analog engraving control signal (G) in a D / A converter (15).
- the analog engraving control signal (G) is then amplified in a downstream analog amplifier (16) and output to the engraving member (4) via the line (7).
- the amplifier (16) can be designed, for example, as a switched current amplifier.
- a new calibration of the engraving signal values (GD) for "light” and “depth” using the setting values (EP L , EP T ) for "light” and “depth” is due for a new engraving job.
- t ) of the previous calibration are saved.
- the tone value "depth” is to be corrected and the corresponding setting value (EP Tnew ) for "depth” is specified.
- the tonal value "light” changes when the tonal value "depth” changes, and previously the value for "light” had to be manually adjusted disadvantageously so that the transverse diagonal (q L ) of the cell “light”” preserved. This disadvantage is eliminated by the automatic adjustment of the "light” value, which takes place in several steps.
- t ) and the predetermined new setting value (EP Tnew ) for "depth” is formed according to the following equation:
- a new setting value (EP Lnew ) for "light” is calculated from the engraving date (GD) for "light”, the old setting value (EP ajt ) for "light” and the previously determined difference value ( ⁇ EP T ).
- EP Lnew 1 / GD L ( ⁇ EP T + GD L x EP Talt )
- the recalibration is then carried out with the specified new setting value (EP Tneu ) for "depth” and the calculated new setting value (EP Lneu ) for "light", the engraving element (4) already being in contact with the printing cylinder (1).
- the sequence in which the new setting values (EP Lneu , EP Tneu ) are activated is advantageously dependent on the fact that the engraving stylus of the engraving device (4) does not already engrave defective cups in the lateral surface of the printing cylinder (1) during the recalibration the previously determined difference ( ⁇ EP T ) between the old setting value (EP Ta! t ) and the new setting value
- FIG. 3 shows a graphical representation to explain the method.
- the setting values (EP) are shown on the ordinate.
- the lines drawn in dashed lines in the illustration for "light” and “depth” symbolize the direct current component around which the engraving stylus of the engraving member (4) swings around the raster signal.
- the "Depth old” value is set to “Depth new” during calibration by ⁇ T, the "Light old” value undesirably changes by ⁇ L to the “Light new” value in the conventional procedure.
- the automatic correction (17) retains the "light old” value when the "depth old” value changes to the "depth new” value.
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98934803A EP0986467B1 (en) | 1997-06-02 | 1998-05-27 | Signal processing method |
DE59801976T DE59801976D1 (en) | 1997-06-02 | 1998-05-27 | PROCESS FOR SIGNAL PROCESSING |
JP50126699A JP3305335B2 (en) | 1997-06-02 | 1998-05-27 | Signal processing method |
US09/424,755 US6717701B1 (en) | 1997-06-02 | 1998-05-27 | Signal processing method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19722760.0 | 1997-06-02 | ||
DE19722760A DE19722760A1 (en) | 1997-06-02 | 1997-06-02 | Signal processing method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998055303A1 true WO1998055303A1 (en) | 1998-12-10 |
Family
ID=7830978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/001442 WO1998055303A1 (en) | 1997-06-02 | 1998-05-27 | Signal processing method |
Country Status (7)
Country | Link |
---|---|
US (1) | US6717701B1 (en) |
EP (1) | EP0986467B1 (en) |
JP (1) | JP3305335B2 (en) |
CN (1) | CN1259082A (en) |
DE (2) | DE19722760A1 (en) |
ES (1) | ES2164442T3 (en) |
WO (1) | WO1998055303A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6430462B1 (en) * | 1997-06-02 | 2002-08-06 | Heidelberger Druckmaschinen Ag | Signal processing method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102208238B (en) * | 2011-03-01 | 2012-11-14 | 中国科学院宁波材料技术与工程研究所 | Neodymium-free and terbium-free high-coercivity sintered rare earth permanent magnet and preparation method thereof |
CN105109253B (en) * | 2015-08-21 | 2018-01-02 | 蒙建宇 | A kind of engraving machine carving depth self-checking device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3893166A (en) * | 1972-01-05 | 1975-07-01 | Crosfield Electronics Ltd | Colour correcting image reproducing methods and apparatus |
US5424845A (en) * | 1993-02-25 | 1995-06-13 | Ohio Electronic Engravers, Inc. | Apparatus and method for engraving a gravure printing cylinder |
WO1996026837A1 (en) * | 1995-02-27 | 1996-09-06 | Ohio Electronic Engravers, Inc. | Engraving method and apparatus using midtone correction |
WO1996026836A1 (en) * | 1995-02-27 | 1996-09-06 | Ohio Electronic Engravers, Inc. | Method and apparatus for generating engraving signals |
-
1997
- 1997-06-02 DE DE19722760A patent/DE19722760A1/en not_active Withdrawn
-
1998
- 1998-05-27 ES ES98934803T patent/ES2164442T3/en not_active Expired - Lifetime
- 1998-05-27 DE DE59801976T patent/DE59801976D1/en not_active Expired - Fee Related
- 1998-05-27 JP JP50126699A patent/JP3305335B2/en not_active Expired - Fee Related
- 1998-05-27 WO PCT/DE1998/001442 patent/WO1998055303A1/en active IP Right Grant
- 1998-05-27 US US09/424,755 patent/US6717701B1/en not_active Expired - Fee Related
- 1998-05-27 EP EP98934803A patent/EP0986467B1/en not_active Expired - Lifetime
- 1998-05-27 CN CN98805731A patent/CN1259082A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3893166A (en) * | 1972-01-05 | 1975-07-01 | Crosfield Electronics Ltd | Colour correcting image reproducing methods and apparatus |
US5424845A (en) * | 1993-02-25 | 1995-06-13 | Ohio Electronic Engravers, Inc. | Apparatus and method for engraving a gravure printing cylinder |
WO1996026837A1 (en) * | 1995-02-27 | 1996-09-06 | Ohio Electronic Engravers, Inc. | Engraving method and apparatus using midtone correction |
WO1996026836A1 (en) * | 1995-02-27 | 1996-09-06 | Ohio Electronic Engravers, Inc. | Method and apparatus for generating engraving signals |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6430462B1 (en) * | 1997-06-02 | 2002-08-06 | Heidelberger Druckmaschinen Ag | Signal processing method |
Also Published As
Publication number | Publication date |
---|---|
US6717701B1 (en) | 2004-04-06 |
CN1259082A (en) | 2000-07-05 |
DE59801976D1 (en) | 2001-12-06 |
DE19722760A1 (en) | 1998-12-03 |
JP3305335B2 (en) | 2002-07-22 |
ES2164442T3 (en) | 2002-02-16 |
EP0986467A1 (en) | 2000-03-22 |
EP0986467B1 (en) | 2001-10-31 |
JP2000512234A (en) | 2000-09-19 |
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